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Allowance for Loan and Lease Losses - Recorded Investment in Loans and Leases (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | $ 4,859,517 | $ 4,837,735
Originated Loans and Leases |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Individually evaluated for impairment | 11,678 | 14,167
Collectively evaluated for impairment | 4,600,520 | 4,558,370
Total | 4,612,198 | 4,572,537
Impaired Financing Receivable, Unpaid Principal Balance | 12,192 | 14,708
Total Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Individually evaluated for impairment | 3,504 | 3,438
Loans acquired with deteriorated credit quality | 10,464 | 11,036
Collectively evaluated for impairment | 233,351 | 250,724
Total | 247,319 | 265,198
Impaired Financing Receivable, Unpaid Principal Balance | 3,689 | 3,652
Commercial and industrial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 1,043,789 | 1,077,635
Commercial and industrial | Originated Loans and Leases |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Individually evaluated for impairment | 1,770 | 1,864
Collectively evaluated for impairment | 1,000,581 | 1,032,059
Total | 1,002,351 | 1,033,923
Commercial and industrial | Total Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Individually evaluated for impairment | 12 | 32
Loans acquired with deteriorated credit quality | 184 | 153
Collectively evaluated for impairment | 41,242 | 43,527
Total | 41,438 | 43,712
Commercial Real Estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 2,401,976 | 2,340,661
Commercial Real Estate | Originated Loans and Leases |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Individually evaluated for impairment | 5,938 | 8,388
Collectively evaluated for impairment | 2,229,275 | 2,153,181
Total | 2,235,213 | 2,161,569
Commercial Real Estate | Total Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Individually evaluated for impairment | 861 | 842
Loans acquired with deteriorated credit quality | 5,800 | 5,852
Collectively evaluated for impairment | 160,102 | 172,398
Total | 166,763 | 179,092
Residential real estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 1,324,206 | 1,333,894
Residential real estate | Originated Loans and Leases |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Individually evaluated for impairment | 3,970 | 3,915
Collectively evaluated for impairment | 1,281,923 | 1,288,346
Total | 1,285,893 | 1,292,261
Residential real estate | Total Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Individually evaluated for impairment | 2,631 | 2,564
Loans acquired with deteriorated credit quality | 4,480 | 5,031
Collectively evaluated for impairment | 31,202 | 34,038
Total | 38,313 | 41,633
Consumer and other |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 73,689 | 70,989
Consumer and other | Originated Loans and Leases |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Individually evaluated for impairment | 0 | 0
Collectively evaluated for impairment | 72,884 | 70,228
Total | 72,884 | 70,228
Consumer and other | Total Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Individually evaluated for impairment | 0 | 0
Loans acquired with deteriorated credit quality | 0 | 0
Collectively evaluated for impairment | 805 | 761
Total | 805 | 761
Finance Leases |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 15,857 | 14,556
Finance Leases | Originated Loans and Leases |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Individually evaluated for impairment | 0 | 0
Collectively evaluated for impairment | 15,857 | 14,556
Total | 15,857 | 14,556
Finance Leases | Total Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 0 | 0
Covered loans | Total Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Individually evaluated for impairment | 0 | 0
Loans acquired with deteriorated credit quality | 0 | 0
Collectively evaluated for impairment | 0 | 0
Total | 0 | 0
Other | Commercial and industrial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 950,383 | 970,141
Other | Commercial and industrial | Originated Loans and Leases |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 908,945 | 926,429
Other | Commercial and industrial | Total Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 41,438 | 43,712
Other | Commercial Real Estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 2,034,240 | 2,004,763
Other | Commercial Real Estate | Originated Loans and Leases |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 1,869,057 | 1,827,279
Other | Commercial Real Estate | Total Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 165,183 | 177,484
Other | Consumer and other |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 59,686 | 58,326
Other | Consumer and other | Originated Loans and Leases |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 58,881 | 57,565
Other | Consumer and other | Total Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 805 | 761
Home equity | Residential real estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 222,713 | 229,608
Home equity | Residential real estate | Originated Loans and Leases |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 204,058 | 208,459
Home equity | Residential real estate | Total Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | $ 18,655 | $ 21,149

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